Merge #19528: rpc: Assert that RPCArg names are equal to CRPCCommand ones (misc)

fa77de2baa40ee828c850ef4068c76cc3619e87b rpc: Assert that RPCArg names are equal to CRPCCommand ones (misc) (MarcoFalke)
fa50bdc755489b2e291ea5ba0e39e44a20c6c6de rpc: Limit echo to 10 args (MarcoFalke)
fa89ca9b5bd334813fd7e7edb202c56b35076e8d refactor: Use C++11 range based for loops to simplify rpc code (MarcoFalke)
fa459bdc87bbb050ca1c8d469023a96ed798540e rpc: Treat all args after a hidden arg as hidden as well (MarcoFalke)

Pull request description:

  This is split out from #18531 to just touch the RPC methods in misc. Description from the main pr:

  ### Motivation

  RPCArg names in the rpc help are currently only used for documentation. However, in the future they could be used to teach the server the named arguments. Named arguments are currently registered by the `CRPCCommand`s and duplicate the RPCArg names from the documentation. This redundancy is fragile, and has lead to errors in the past (despite having linters to catch those kind of errors). See section "bugs found" for a list of bugs that have been found as a result of the changes here.

  ### Changes

  The changes here add an assert in the `CRPCCommand` constructor that the RPCArg names are identical to the ones in the `CRPCCommand`.

  ### Future work

  > Here or follow up, makes sense to also assert type of returned UniValue?

  Sure, but let's not get ahead of ourselves. I am going to submit any further works as follow-ups, including:

  * Removing the CRPCCommand arguments, now that they are asserted to be equal and thus redundant
  * Removing all python regex linters on the args, now that RPCMan can be used to generate any output, including the cli.cpp table
  * Auto-formatting and sanity checking the RPCExamples with RPCMan
  * Checking passed-in json in self-check. Removing redundant checks
  * Checking returned json against documentation to avoid regressions or false documentation
  * Compile the RPC documentation at compile-time to ensure it doesn't change at runtime and is completely static

  ### Bugs found

  * The assert identified issue #18607
  * The changes itself fixed bug #19250

ACKs for top commit:
  laanwj:
    Code review ACK fa77de2baa40ee828c850ef4068c76cc3619e87b
  fjahr:
    tested ACK fa77de2baa40ee828c850ef4068c76cc3619e87b
  theStack:
    ACK https://github.com/bitcoin/bitcoin/pull/19528/commits/fa77de2baa40ee828c850ef4068c76cc3619e87b
  ryanofsky:
    Code review ACK fa77de2baa40ee828c850ef4068c76cc3619e87b. Pretty straightfoward changes

Tree-SHA512: badae1606518c0b55ce2c0bb9025d14f05556532375eb20fd6f3bfadae1e5e6568860bff8599d037e655bf1d23f1f464ca17f4db10a6ab3d502b6e9e61c7b3d3

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